class_docstr: Input is the dy and output is the dx.
  Use the function.backward in the forward_impl.
  Use the function.forward in the backward_impl.
class_docstr_tok: ["Input","is","the","dy","and","output","is","the","dx",".","Use","the","function.backward","in","the","forward_impl",".","Use","the","function.forward","in","the","backward_impl","."]
code: def yshape(self):
      return self._yshape
  
file_path: nnabla/python/src/nnabla/backward_function/max_pooling_backward.py
imports: import nnabla
  import nnabla.function
  from nnabla.function import PythonFunction
label_desc: Use image node_id 7 for calling the MaxPoolingBackwardDataGrad obj's underlying member method code with example usage: obj.yshape() and returns: self